EP 0430047 A3 19920826 - A METHOD FOR ROLLING ON-GAUGE HEAD AND TAIL ENDS OF A WORKPIECE
Title (en)
A METHOD FOR ROLLING ON-GAUGE HEAD AND TAIL ENDS OF A WORKPIECE
Publication
Application
Priority
US 44369789 A 19891129
Abstract (en)
[origin: US4998427A] A method for making delivery gauge corrections at low mill speeds during threading and tailing out of a workpiece by varying the interstand tension of the workpiece. The tension between the last two stands is used with a desired tension and the delivery AGC by tension mode of an existing delivery automatic gauge control (AGC) to change the speed of the downstream stands. During the threading and tailing out phases, the delivery AGC by speed is turned off and set to zero. In the full run phase, the interstand regulators are changed to a tension by roll gap mode, and an existing delivery automatic gauge control (AGC) by speed is used to provide a stand speed reference for the downstream stands. In the full run phase, the delivery (AGC) by tension is turned off an set to zero. In the tailing out phase optionally, the tension between each stand is used in a similar manner to provide a speed reference change for each stand immediately downstream from where a tension controller is located.
IPC 1-7
IPC 8 full level
B21B 37/46 (2006.01); B21B 37/18 (2006.01); B21B 37/52 (2006.01); B21B 37/72 (2006.01)
CPC (source: EP US)
B21B 37/52 (2013.01 - EP US); B21B 2273/08 (2013.01 - EP US); B21B 2273/10 (2013.01 - EP US)
Citation (search report)
- [AD] US 3848443 A 19741119 - PETERSON R, et al
- [A] US 4162624 A 19790731 - MOROOKA YASUO [JP], et al
- [AD] US 4286447 A 19810901 - PETERSON ROBERT S
- [A] IRON & STEEL ENGINEER vol. 64, no. 10, October 1987, PITTSBURG USA pages 45 - 49; A. SMITH: 'Modernisation of a tandem cold mill with distributed digital control'
Designated contracting state (EPC)
AT BE CH DE DK ES FR GB GR IT LI LU NL SE
DOCDB simple family (publication)
US 4998427 A 19910312; BR 9006041 A 19910924; CA 2031052 A1 19910530; CN 1053199 A 19910724; EP 0430047 A2 19910605; EP 0430047 A3 19920826; JP H03238113 A 19911023
DOCDB simple family (application)
US 44369789 A 19891129; BR 9006041 A 19901128; CA 2031052 A 19901128; CN 90110321 A 19901129; EP 90122224 A 19901120; JP 33342490 A 19901129